The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 11, 2018
Filed:
Jul. 28, 2015
Caba Moldvai, Dublin, CA (US);
Caba Moldvai, Dublin, CA (US);
MICROSOFT TECHNOLOGY LICENSING, LLC, Redmond, WA (US);
Abstract
In various embodiments, methods and systems for controlling display illumination is provided. A display illumination system supports maintaining color stability and reducing perceived flicker while changing the brightness of a display. The display illumination system supports light emitting diode (LED) sequencing using a pulse width modulation (PWM) control circuit for controlling the brightness and dimness of LEDs. In operation, the PWM control circuit drives the plurality of LEDs based on generating control signals for two or more subframes of an image frame. Specifically, within each subframe, at least two control signals are generated therien. In one embodiment, the display illumination system supports a display of an optical see-through head mounted display (HMD) device. In particular, the HMD device includes LEDs that allow a user to observe their physical surroundings, while LEDs and other optical elements add light into a visual path of a user to provide an augmented reality image.